package com.hmdp.utils;

import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * @author guozh
 */
@Slf4j
@Component
public class RedisIdWorker {
    // 开始时间戳
    private static final long BEGIN_TIMESTAMP = 1735689600L;

    //  序列号位数
    private static final long COUNT_BITS = 32;

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    public long nextId(String keyPrefix) {
        // 1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;

        // 2.生成序列号
        // 获取当前日期
        String format = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));

        //  获取自增序列号
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + format);

        //  拼接并返回
        return timestamp << COUNT_BITS | count;
    }

    public static void main(String[] args) {
        LocalDateTime date = LocalDateTime.of(2025, 1, 1, 0, 0, 0);
        long epochSecond = date.toEpochSecond(ZoneOffset.UTC);
        log.info("{}", epochSecond);
    }
}
